title   
  

Hydrogen adsorption of carbon nanotubes grown on different catalysts

Dündar Tekkaya, Ezgi and Karatepe, Nilgün (2014) Hydrogen adsorption of carbon nanotubes grown on different catalysts. International Journal of Hydrogen Energy . ISSN 0360-3199 Published Online First http://dx.doi.org/10.1016/j.ijhydene.2014.10.145

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Official URL: http://dx.doi.org/10.1016/j.ijhydene.2014.10.145

Abstract

Single wall carbon nanotubes (SWCNTs) were synthesized by catalytic chemical vapor deposition of C2H2 at 800°C for 60 min. Catalysts were prepared by impregnation of transition metals (Fe, Co, Ni, V and bimetallic mixture of Fe-Co) on MgO powder substrate with a metal to MgO ratio of 5:100. After the synthesis, the samples were purified by liquid phase oxidation method with 1.5M HNO3 for 30 min at 210°C. The samples were characterized by thermal gravimetric analysis, scanning electron microscopy, X-ray diffraction and Raman spectroscopy. The hydrogen storage capacities of purified SWCNTs were investigated by volumetric method. It was found that the hydrogen uptake was in the range of 2.76-5.25 wt% at cryogenic temperature and 100 bar pressure. The maximum capacity was obtained with purified SWCNTs produced on Fe catalyst whereas purified SWCNTs grown on Fe-Co catalyst had the minimum hydrogen uptake.

Item Type:Article
Uncontrolled Keywords:Single wall carbon nanotubes, hydrogen storage, catalyst effect
Subjects:Q Science > QD Chemistry
ID Code:25976
Deposited By:Ezgi Dündar Tekkaya
Deposited On:22 May 2015 16:04
Last Modified:03 Sep 2019 11:48

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